
http://factoryidle.com/
I've encountered this gem a couple of days ago. You may say, idle game as many others. But there is one difference: instead of plain buying better money makers, you have to build them from machines and transport belts on limited space - just like in Factorio

It's quite addictive. Fun part is that ratios between factories vary as you buy upgrades so you have to redesign everything each time you upgrade stuff. Well, just try yourself!
[EDIT]
After some thought: should this topic stay here or go to offtopic forum?